Bhagavan Ramana Maharshi was speaking once with a visiting pandit about the great merits of the Bhagavad Gita, when a devotee complained that it was difficult to keep all the seven hundred verses in mind and asked if there was not one verse that could be remembered as the quintessence of the Gita. Bhagavan thereupon mentioned Chapter X, verse 20 'I am the Self, Oh Gudakesa, dwelling in the Heart of every being; I am the beginning and the middle and also the end of all beings.' Later he selected forty-two verses that follow (of which the above verse comes as fourth) and arranged them in an appropriate order to serve as guidance. He also prepared Tamil and Malayalam versions of these verses.
In this audio collection, Our Swamiji Ramana Swaroopanandaji explains the meanings of tamil version of Gita Saaram.